Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Posters II
DY 29.8: Poster
Thursday, March 29, 2012, 17:00–19:00, Poster A
The stationary state of time-periodically driven ideal gases coupled to a thermal bath. — •Daniel Vorberg1,2, Waltraut Wustmann2, André Eckardt1, and Roland Ketzmerick1,2 — 1Max-Planck-Institut fuer Physik komplexer Systeme, Noethnitzer Str. 38, 01387 Dresden — 2Institut fuer Theoretische Physik, Technische Universitaet Dresden, 01062 Dresden
Time-periodically driven quantum systems that are coupled to a thermal bath possess a stationary state that generically does not obey detailed balance. We consider ideal gases of many non-interacting bosonic or fermionic particles and show that, as a consequence, their stationary state is generally not described by a Gaussian density operator. Accordingly, also Wick's theorem does not hold. This contrasts the behavior of non-driven systems. However, studying rather generic time-periodically forced model systems with regular and chaotic states, we find that a Gaussian ensemble can still be a very good approximation to the stationary state. Hence, Wick's decomposition of n-particle correlation functions is possible in an approximative sense.